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CBSE Class 10 Science Solved Question Paper 2016

Multiple Choice Questions

1. A student obtained a sharp image of a candle flame placed at the distant end of the laboratory table on a screen using a concave mirror to determine its focal length. The teacher suggested him to focus a distant building, about 1 km away from the laboratory, for getting more correct value of the focal length. In order to focus the distant building on the same screen, the student should slightly move the:

mirror away from the screen
screen away from the mirror
screen towards the mirror
screen towards the mirror

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2. To determine the approximate focal length of the given convex lens by focussing a distant object (say, a sign board), you try to focus the image of the object on a screen. The image you obtain on the screen is always

erect and laterally inverted
erect and diminished
inverted and diminished
inverted and diminished

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3. Select from the following the best experimental setup for tracing the path of a ray of light passing through a rectangular glass slab.

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Study the following figure in which a student has marked the angle of incidence (<i), angle of refrcation (< r), angle of emergence (< e), angle of prism ( < A) and the angle of deviation (<D). The corrected angles are:

$angle straight A space and space angle straight i$
$angle straight A comma space angle straight i space and space angle straight r$
$angle straight A comma space angle straight i comma space angle straight e space and space angle straight D$
$angle straight A comma space angle straight i comma space angle straight e space and space angle straight D$

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Which of the following sets of materials can be used for conducting a saponification reaction for the preparation of soap?

Ca(OH)₂and neem oil
NaOH and neem oil
NaOH and mineral oil.
NaOH and mineral oil.

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A student takes four test tubes marked P, Q, R and S of 25 mL capacity and fills 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as − KCl in P, NaCl in Q, CaCl₂in R and MgCl₂in S . He then adds 2 ml of a sample of soap solution to each of the above test tubes. On shaking the contents of each of the test tubes, he is likely to observe a good amount of lather (Foam) in the test tubes marked.

P and Q
R and S
P, Q and R
P, Q and R

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Consider the following comments about saponification reactions;
I. Heat is evolves in these reactions.
II. For quick precipitation of soap, sodium chloride is added to the reaction mixtures.
III. Saponification reactions are a special kind of neutralization reactions.
IV. Soaps are basic salts of long-chain fatty acids